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7060 tach
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acer View Drop Down
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Joined: 10 Jun 2010
Points: 140 		Post Options Post Options   Thanks (0) Thanks(0)   Quote acer Quote  Post ReplyReply Direct Link To This Post Topic: 7060 tach
    Posted: 20 May 2011 at 8:49am
on a delco alternator with post for tach signal how much voltage should be there? is it low to high as engine speed increases? i cant seem to make my tach work i need to double check gauge itself but im reasonably sure its good and has power. is there a ohm test on gauge to confirm this,   thanks  
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Joined: 29 Oct 2009
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Points: 723 		Post Options Post Options   Thanks (0) Thanks(0)   Quote skipwelte Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2011 at 9:26am

The voltage at the tach signal is only about 3-4 volts and its AC not DC, what the tach picks up is the AC sine wave not so much the voltage.     An alternator is a three phase alternating current generator, the rectifier changes the AC to DC, the tach picks up one of the AC phases and counts the sine wave fluctuations and turns that signal into a linear readout.    HTH    

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Points: 140 		Post Options Post Options   Thanks (0) Thanks(0)   Quote acer Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2011 at 10:45am
many thanks thats good info   
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Points: 140 		Post Options Post Options   Thanks (0) Thanks(0)   Quote acer Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2011 at 9:56am
okay so i have ac voltage at alt. terminal and at tach terminal on the tach as well as power on the + terminal  - is grounded as it should be. does this mean my tach is junk?
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Points: 187 		Post Options Post Options   Thanks (0) Thanks(0)   Quote monitordoc Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2011 at 10:01am
 Tach may be ok. there are three terminals on the back. one is 12 volts, 2nd is ground and third is signal from alt.
WD,D17-S4,180,D21
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Points: 140 		Post Options Post Options   Thanks (0) Thanks(0)   Quote acer Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2011 at 4:13pm
yes i have 12 volts on + terminal - terminal is grounded (ac tap ) has 3 to 6 volts ac to it the hour meter is working but no tach needle movement. i have also notice in the parts breakdown some models use a resistor and a capacitor on connections on back of the tach, is this necessary?   thanks   
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